core

Romana Core Components

Romana is a new Software Defined Network (SDN) solution specifically designed for the Cloud Native architectural style. The result of this focus is that Romana cloud networks are less expensive to build, easier to operate and deliver higher performance than cloud networks built using alternative SDN designs.

What's in this repository

This repository contains the core components of the Romana system: A series of cooperating microservices written in Go. These services currently are:

• Root: Used as the starting point for services to discover each other. Also holds the configuration and serves relevant parts to the other services.
• Tenant: Manages tenants in the Romana system, interfaces with environments such as OpenStack, to map their tenants to Romana tenants.
• Topology: Keeps track of the network topology in which we are deployed, knows about hosts, racks, spines, etc. This information is the used by the IPAM service.
• IPAM: Generates and manages the IP addresses Romana assigns to network endpoints. Uses the topology service to be able to create topology aware addresses.
• Agent: Lives on hosts and there performs actions on behalf of Romana, such as creating interfaces, setting routes or iptables rules.
• Auth: Serves authentication tokens to tenants and services.

Getting started

Setup the Go development environment

First, you need to setup a Go development environment. You can skip this if you have a development environment already.

Option A: Using binary distribution

• Download https://storage.googleapis.com/golang/go1.5.3.linux-amd64.tar.gz

• Unpack to /usr/local/go: sudo tar -C /usr/local -xzf go1.5.3.linux-amd64.tar.gz

• Update your profile to include:

  if [ -d /usr/local/go/bin ]; then
    PATH="$PATH:/usr/local/go/bin"
    export GOPATH="$HOME/go"
    export GO15VENDOREXPERIMENT=1
  fi
  

Option B: Installing from source

• Follow the instructions here: https://golang.org/doc/install/source

Download, build and test the Romana core source code

Once you have your Go environment, follow these steps to download, build and test the Romana core components:

1. Prepare a Go workspace.
2. Ensure your PATH is set to find your Go installation and binaries.
3. Ensure the GOPATH environment variable is set to point at the root of your workspace.
4. Define and export GO15VENDOREXPERIMENT=1
5. Inside of the workspace directory run: go get github.com/romana/core/... (the three dots at the end are part of the command).
6. You may see an error at this point, complaining about No submodule mapping found in .gitmodules.... This is due to a known bug in "go get". You can fix that by running cd $GOPATH/src/github.com/romana/core ; git submodule update --init --recursive.
7. If you wish to work with a specific branch or tag you need to run: git checkout <branchname> ; git submodule update --init --recursive.
8. To run unit test for a specific Romana service run: go test -v github.com/romana/core/<name>, where <name> might be agent, root, ipam, tenant or topology.

Update a running cluster with your modified code

If you use the 'romana-setup' script (provided in the https://github.com/romana/romana repository), you get an OpenStack DevStack cluster running on some EC2 instances. It installs a standard version of the Romana core components.

Let's say you have made changes to the core services and wish to test them on a running cluster. Here are the instructions describing how to replace the binaries on the cluster and how to restart the services:

1. After successfully compiling your code locally, you will find the binaries in $GOPATH/bin as agent, root, ipam, tenant and topology.

2. Upload these binaries to every host in the cluster (every EC2 instance) with this command: rsync -e 'ssh -i <absolute path to your SSH key .ssh/ec2_id_rsa>' -azu --existing "$GOPATH/bin/" ubuntu@<ec2-ip-address>:~/romana/bin/. This command needs to be executed for every EC2 instance in the cluster. Please remember to specify the correct IP address of the EC2 instance and the absolute path to your SSH key where indicated.

3. Log into the controller host and restart the services with these commands (note that only root and agent need to be re-started manually, other services will re-start on their own):

   for i in ipam tenant topology root agent; do
       sudo service romana-$i stop
   done
   sudo service romana-root start
   sudo service romana-agent start
   

4. On the compute host(s), restart the services with these commands:

   sudo service romana-agent stop
   sudo service romana-agent start
   

Previous Releases

Previous Releases can be found here.